BuddyPress & bbPress + Cloudflare + Firefox 12 = slow post ?!!!

I recently noticed that when I try to create a group, start a topic or posting a forum reply, it’s taking about 30+ second before the topic/reply is show up. If you try to tell me there may be a “bad plugin” and try to disable all of it except bbPress & BuddyPress, save it. I have tried the following:

1. Using different browser.
I find out that when I try to use Firefox 12.0 to post, it’s loading extremely slow. But this is not happening in Internet Explorer 9 or Google Chrome 18.
Try to start Firefox in safe mode? Yes I have tried to do that but it doesn’t make a difference.

2. Using different user/computer.
It’s still the same.

3. Try to post a comment in a normal post / post an update.
I was able to comment a post & post an update without any problems, so I think it may be a “bad plugin” problem.

4. Disable all plugin (except bbPress & BuddyPress)
But the same thing happen. FYI I don’t edit either the bbPress or BuddyPress files.

5. Using different theme.
I replace my modified custom community theme with BuddyPress Default theme and see if I putting bad codes in my theme. But this doesn’t solve problem even I tried other themes.

6. Change permalink structure.
It doesn’t make any changes, and I don’t think it will help.

8. Create a new install in another domain.
I use http://scirefs.com/ as my main and http://www.scirefs.org as a sandbox (with the same configuration as in SCIREFs.com) with only bbPress and BuddyPress activated. But everything works fine in SCIREFs.org with either and I have no issue with slow response in Firefox 12.

9. The Cloudflare……
Since I have Cloudflare as my CDN for SCIREfs.com but not SCIREFs.org, I tried to remove SCIREFs.com from Cloudflare and add SCIREfs.org to it and see what happens. The result: The issue with Firefox at SCIREFs.com disappear but SCIREfs.org is now facing the old issue.

Do anyone here have any ideas what’s wrong with it? Or someone here is facing the same problem?